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The purchased two solar charge controller MPPT 80A enter the sleep mode after using for a month. What is the reason?

The purchased two solar charge controller MPPT 80A enter the sleep mode after using for a month. What is the reason?

2021-01-28

①You can use a multimeter to test the voltage of the PV terminal

②: Is there any special weather before the sleep mode; for example: thunder and lightning, heavy rain or lightning, etc.

③Improper system construction will also affect 


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